package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //获取token,
        String token = request.getHeader("authorization");
        //判断是否存在，进行拦截
        if(StrUtil.isBlank(token)){

            return true;
        }

        //从redis中根据提供的token来查找对象
        Map<Object, Object> entries = stringRedisTemplate.opsForHash().entries(RedisConstants.LOGIN_USER_KEY + token);
        if(entries.isEmpty()){

            return true;
        }
        //将从redis中获取的map对象转换为userDTO来存储在threalocal中
         UserDTO userDTO = BeanUtil.fillBeanWithMap(entries, new UserDTO(), false);
        //获得的对象存到threaLocal中
        UserHolder.saveUser(userDTO);
        //更新redis中对应的k-v时间
         stringRedisTemplate.expire(RedisConstants.LOGIN_USER_KEY + token,RedisConstants.LOGIN_USER_TTL,TimeUnit.MINUTES);
        //放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        UserHolder.removeUser();
    }
}
